Lock nut



Aug. l5,v 1933. UNDERMAN 1,922,378

LOCK NUT Filed Oct. 5, 1952 INVENTOR gm@ @M www Patented Aug.15,1933 l i1,922,373

t "UNITED "STATES PATENT OFFICE l l 1,922,373 i d l LOCK NUT 'Andrew`Lyle Linderman, Pittsburgh, lla., assignor to Neely Nut,& Bolt Company,a Cor- V,poration of `Pennsylvania` i ,i

Application october 5, 1932. serial Np. 636,345

' claim. (o1. 151413) b My invention relatesto lock-nuts, andconobjections will be obviated. My nut-lock comstitutes aspecificimprovement` which has been prises a ,pair of nuts substantiallyidentical in found to render an Vearlier lock-nut structure structure,each `nut being the duplicate of the commercially practical. The earlierstructure to other; th'e nuts,are.'interchangeable; they may which vIrefer is foundin Letters `Patent of lthe be manufactured in one and thesame machine 50 United States, No. 732,590, granted June 3o, 1903, orprocess; the` threaded bores of any vtwo nutsv to August Scholer.` j areidentical in length, whereby the strength of The `lock-nut structure ofthe above-noted pat- Onefnutis as great as the other, and either may lentcomprises one nut provided withan eccentric be` independently put toservicev When paired' 1Q` boss and a second nut provided with Aacorrefor service,the nuts of the instant invention co- 65 spondinglyeccentric recess.` The two nuts are Operate to afford an efficientlock-nut structure, assembled upon the threaded shank of a bolt, in themennerelreedy described With reSDeCt t0 the bossfon one nut'lying withinthe recess of the structure of Patent N01 732,590-

the other; together thepair ofnuts are run downV In the accompanyingdrawing a nut embodying the shank of the bolt,"`,unti1 the lower orinner the invention is shown in top plan, side elevation,` 70 nut issecureagainst the parts to be integrated, and bottom plan in Figure I;Figure Il is a View and then the upper or'` outer nut of the pair is ofa bolt inf` side elevation, showing two nuts in independently'tightened. Thus, the eccentric assembly upon the bolt,l to serveiasalock-nut; boss of one nut is `shifted within `the eccentric and FigureIII, is a diagrammatic view in'horirecess of A.the other, the side`wallfof the boss Zontal section of the essential elements ofia nut- 75`wiedging against the wall of the recess and tendforming machine,showing how certain of such .ing with great, force t0 Shift the nutslaterally elements are elaborated, to accommodate the one with respectto the other. Manifestly, the ready manufacture of my lock-nut. Y leffect of this wedging action is to force the two AS a matter 0f ChOCe,Iheve illuStIated the 2 5dnuts tightly against opposite faces of thethreaded invention as it iS elnbOded in e Square nut 1 80 bolt; thewedging force of theeccentric boss, and (Figure I)- The nut iSDIOVidedWth e threaded the opposing pressures, thereby created betweenhere 2, and a bOS'S 3 prOieCtSfrOm the upper the nuts and the bolt,produce an emeient and face of the nut, while a recess 4 is .formedwithdurable interlocking of the parts. b in its nether face. The boss 3and the recess 4. 3o It has been known for years that a lock-nut areeach Circular in plan: they are Comple- S5 of this nature isfunctionally an eicient and denientnry in Shape, and eeCh iS lOCSJtedeeeentrisirable structure, but unfortunately the cost of Gally 0f thehere 2, S0 that the bOSS 0f One hut producing it has prevented itsuniversal adoption may be nested Within the I'eCeSS 0f a SeCOnd in theart. Each of the pairof interlocking nuts nut, While maintaining thethreaded bOleS 0f is structurally distinct from the other-the one -bOthnuts in eXeCt alignment," Indeed, I adVn- 90 having a boss' upon its`face and the other in;V tageously provide an `index notch 40 on theside cluding a recess. Accordingly, for a single servof each nut, tofacilitate` in the hands of the ice, two distinct nuts must be stockedby the user, Werkman the VprODer InetChing tOgetheI 0f 011e and, each`nut being structurallydistinct, two nut With anOtheI- TWOnutS 1u, 1b,S0 eJSSem- 4,0diierent manufacturing set-ups arerequired bled may, then,be turned aS a Single nut upon. 95 to manufacture the lock-nutstructure. Addithe Shank 0f bOlt 5, Figure II When, during tionally, itwill be `understood that the recessed the SCreWiIlg heme 0f thepair 0fnutS, the 10Wer nut has a shorter bore than theembossed nut, 01 innernut 1b iS Securely tightened egainSt and, `therefore,the recessed nut isnot strong` parte P,` `P t0 be bOlted together, the Wrench or T enoughto be safely employed alone, as an ordi-V other` tool being employed isshifted to engage 100 nary non-locking nut-such general utility being'Only the'upper nut 1(1- The nut la iS turned Still desirable. Ofcourse, the two distinct nuts are further, the lOWer nut 1b being heldby the parts not interchangeable, but `rnust be accurately P, Pagainstfurther rotation. Thus the nut 1a paired before assembly. Thesein the main are is shiftedradially of nut 1b, and the eccentric.

,50.factors which for `yearshave barred the comwall of recess 4 in nut1a wedges against the 105 s-patent, to the end that alltheabove-mentioned shank 5a.` As already eXPlened, a highly elllmercialuse ofthe otherwise valuable nut-lock side of boss 3 on nut 1b.Accordingly, the nut structure, alluded to above. la is caused to bindforcefully against one side My invention comprises a particular renneofthe threaded shank 5a, and nut 1b is likewise b ment in the nut-lockdisclosed in the above-noted caused to bind against the opposite side ofthe cient interlocking of the parts is obtained by this action of thenuts.

Figure III illustrates in general the elements of a commonly known`nut-forming machine, Which elements have been successively employed inthe manufacture of my specialized nut. The machine comprises a die-box30, Within the matrix 31 of which die-box a crowner 32 is located.Employing the nomenclature of the art, a cut-oir 33 is organized beforethe matrixof the die-box and in opposition to the crovvner 32; a piercer34 is reciprocatory Vaxially Within the cut-off, and a kick-out issimilarly 1ocated Within the crowner 32. Meansof known structure andoperation are adapted powerfully to shift the parts in the manner aboutto be described, to form the nut of my invention. Suiiice.

to say that the die-box is rigidly mounted in the nut-forming machine,and means Well-known to the art advance a preheated bar of stock S,step.- by-step and in synchronism with the movement of the other machineelements.

The stock-feeding device (not shown) advances the stock S tothe positionin which it is shown in Figure III; thereupon the cut-off 33 advances toward the die-box 30, and shears a nutblank from the bar, on the line L.The movement of the cutoff 33 is continuedcarrying the nut-blank intothe matrix Bland against the face of crowner 32. In accordance With myinvention, theface of the cut-ofi" 33 is' provided with' an eccentricIboss 36, and the face of the crowner is provided with an eccentricrecess 37. The nut-blank is compressed between the cut-off and thecrovvner, within the matrix 31, and the boss 36 and recess 37, by reasonof their complementary form and identical eccentricity, effect a bodilydisplacement of the metal in. the central region of the blank, to formrespectively the recess 4 and boss 3 in the nut. Next, the piercer 34 isadvanced and punches a hole through the nut-blank; then the cut-off 33and piercer 34 are Withdrawn from the matrix 31; next the crowner isshifted, to move the formed nut from the matrix 31; and finally thekick-out 35 is shifted Within the crowner, to eject from the bore of thecrowner the slug resulting from the piercing of the blank. If necessarya kickoff-a known device indicated by the dotted lines 23S-may beoperated to assist in removing the formed nut from the mouth of thematrix 31. the operation is automatically repeated for the manufactureof the specialized nut of my invention, and machines already in servicein the various nut-manufacturing plants in the country may be equippedto do the job.

The index notch 40 is formed on the side of the nut, by means of a ridge31a, which is provided on the Wall of matrix 31. A groove 33a is formedin the cut-off 33, to provide clearance for the ridge 31a, during theoperation of the machine.

The bore of each nut, of course, is threaded. The usual continuousthreading machines may be employed for this purpose. I may remark,however, that, when the nuts are fed in close succession to thethreading machine, there is a tendency for them to lock with one anotherupon the tap. To prevent such condition, a nut of ordinary constructionmay be alternated with the specialized nuts, as they are fed upon thetap, and so any unusual tendency for the nuts to stick upon the tap isavoided. v

I claim as my invention:

A metal nut adapted to be paired with a substantially identical nut tovform a lock nut assembly, which nut includes a threaded bore, said nutincluding in its body region immediately surrounding said bore a bodilydisplacement of metal, providing upon the upper face of the nut aneccentric boss, and providing within the nether face of the nut acomplementary eccentric recess.

ANDREW LYLE LINDERMAN.

